MODS!
These are my mods and others you can do!
The first thing anybody does when they get a toy is PLAY WITH IT!!! Like many before me, I like to tinker, and I love to go faster!!! Here is how I am going faster with the DUNE!!!
Starting with Air, Fuel, and Exhaust
The most restrictive equipent on any vehicle will always be the air in, exhaust out, and fuel..... Being that I teach auto, I have access to equipment which makes my job that much easier! First modification I performed, was cutting the stock exhaust open, and physically remove the internal baffles of the muffler with an O/A torch, and then MIG the hollow muffler back together... This lets more air out!!!!! Here is a link to one of the most informative websites in regards to mini-buggies ... www.buggynews.com AND..... This is a link to the exhaust modification I performed, as well as a couple others-- http://www.buggynews.com/topic8144.html
NOW.... As I get more exhuast out... I need more air and fuel in!!
Here is a little PLUG!!!! For my parts, YOU NEED TO KNOW ABOUT www.bladeperformance.com CHECK THEM OUT!!!!!!!!! ALL YOUR PERFORMANCE PARTS ARE HERE...... CHEAP!!!!!!!!
Now, for the Air in- or "INTAKE" The stock box is restrictive... Huge performance gains come from just intake modifications. Mine was simple. Remove stock airbox- replace with a chrome UNI FILTER! Now I have a cold air filter, and free flowing exhaust... Last thing to balance it all, I need more fuel!
After you clear up the breathing, you have to add more fuel. You cant make the machine work harder without feeding it!!! The carburator has a MAIN JET located in the fuel bowl at the bottom of the carb... This can easily be swapped out by loosening the clamps on both sides of the carb, and twisting the carb counter-clockwise, so that the fuel bowl is facing outward... ! ! ! ! ! IMPORTANT ! ! ! ! ! There is still fuel in the carb and it will spill... You can drain it before you do this, but you always need to clean it afterwards!!! NEVER leave spilled fuel on top of a motor... N E V E R!!! After you get the fuel bowl off (removing all 4 screws), the largest brass screw, sticking the farthest down at the bottom of the carb is the MAIN JET. You simply unscrew it and replace it with your new one!!! I started with the 128 Jet and have run it pretty well so far...I keep checking the sparkplug to make sure that the motor is not running too rich (black), or too lean (white)... If either condition exsists, I change the JET to alter the amount of fuel. If the plug is black, too much fuel... I'd need smaller jet... If the plug is white, not enough fuel... I'd need a bigger jet! At $4.00 a peice, you can afford to buy a few on both sides to experiment and be happy with!! (I bought the 128, 130 and the 132. I am happy so far! )
click to see the larger image---this is the UNI- I used the original air inlet hose for the intake, however, you need to insert a sleeve into the hose to keep it rigid when you clamp the fileter on...1 1/2 inch exhaust pipe from autozone or even same diameter drain pipe from home depot will do the trick!
below is a pic of the jets.... those are two sizes extra that I purchased incase I needed to add or remove fuel to get the right mix!



